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The evidence of Mcannot be doubted any more under certain experimental conditions so I raise the question about H-; is it stable in the solutions and does it absorb light as Na-, K-, etc., do? During electrolysis in, e.g., ether between two sodium electrodes, will sodium dissolve at the cathode forming anions or at the anode forming cations or on both sides?Comment: Pulse radiolysis should be done in connection with polarography to get other than optical evidence for Mformation; it also would yield redox potentials.J. W. FLETCHER. H is not stable in these solutions. J. L. DYE. The major remaining difference between the results of pulse radiolysis and of metal solution studies is the difference in the ir band of es" and of metal solutions with crown or cryptand present. This may tell us something about the nature of the species in the latter case. We must remember that the metal solutions are several orders of magnitude more concentrated in the reducing species (10-4 to 10-3 M) than in pulse radiolysis so we may have ß22-or e--M'e~or other spin-paired species.

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-.The optical absorption .spectrum of the solvated electron in· ·· ethanol has been determined again to establish whether a report of